Classification Of Sealants By Vulcanization Method
This kind of sealant series uses the moisture in the air to vulcanization. It mainly includes one-component polyurethane, silicone rubber and polysulfide rubber, etc. Its polymer base material contains active genes. Can react with water in the air to form a crosslinking bond to make the sealant sulfide into a reticular structure. Moisture in the atmosphere acts as a catalyst in the vulcanization reaction. Chemical vulcanizing Type sealant: Two-component polyurethane, silicone rubber, polysulfide rubbers, neoprene and epoxy resin sealant are generally at room temperature conditions to complete vulcanization. Some mono-component sulfonated polyethylene and neoprene sealant, as well as polyvinyl chloride sol paste-like sealant such as automotive spot-welding adhesive, must be cured by chemical reaction under conditions of addition. Hot-Transition Sealant: The use of plasticizers dispersed polyvinyl chloride resin and asphalt containing rubber sealant is two different types of thermal transformation system. Vinyl resin plasticized body at room temperature is the liquid suspension by heating into solid and hardened and rubber-bitumen and sealant is hot melt.